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Related Concept Videos

Velocity and Position by Graphical Method01:34

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Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to...
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Instantaneous Velocity - II01:10

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Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...
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To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object is (its position) during its motion, but also how fast it’s moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position, a particular time is assigned. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity v.
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Related Experiment Video

Updated: Jul 30, 2025

A Novel Application of Musculoskeletal Ultrasound Imaging
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Target Velocity Ghost Imaging Using Slice Difference Method.

Fan Jia1, Zijing Zhang1, Yuan Zhao1

  • 1School of Physics, Harbin Institute of Technology, Harbin 150001, China.

Sensors (Basel, Switzerland)
|May 13, 2023
PubMed
Summary
This summary is machine-generated.

Ghost imaging now provides velocity images of moving targets. This new method enhances signal-to-noise ratio and resolution for crucial applications like security monitoring.

Keywords:
ghost imaginghigh resolutionslice difference

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Area of Science:

  • Optical imaging
  • Quantum imaging

Background:

  • Ghost imaging leverages correlations between reference and signal arms for target intensity imaging.
  • It offers improved signal-to-noise ratio and resolution compared to traditional laser active imaging.

Purpose of the Study:

  • To introduce a novel ghost imaging scheme for obtaining velocity images of moving targets.
  • To enhance multi-dimensional information acquisition for dynamic targets.

Main Methods:

  • Utilized the slice difference method within a ghost imaging framework.
  • Performed theoretical analysis and a proof-of-principle experiment.

Main Results:

  • Achieved a 64x64 resolution velocity image of moving targets.
  • Demonstrated a significant increase in signal-to-noise ratio compared to direct imaging.
  • Experimental results aligned well with theoretical predictions.

Conclusions:

  • Successfully demonstrated a functional velocity imaging protocol using ghost imaging.
  • This advancement addresses the need for moving target detection in areas like security and attitude perception.